import pgzrun


def draw():

    #主要练习全背景填充，认识坐标
    # red black yellow green orange blue purple
    screen.fill('green')
    screen.draw.filled_circle((200, 300), 100, 'purple')
    screen.draw.filled_circle((400, 300), 100, 'purple')
    screen.draw.filled_circle((600, 300), 100, 'purple')

pgzrun.go()
